I'm not sure if this is something you've been playing for a while, but I'm interested in your approach. (Specifically the Sylvan Caryatid)
How was the Caryatid? Could you envision a Vintage deck that plays more than one? Or is it just only viable as a singleton with GSZ?
I've been testing GSZ for about a month and a half. The list I played on the VSL had no general meta applicability as it was tuned for what I expected in the Pod.
The Caryatid is great. I like the extra acceleration to pump out Jace, GSZ, Leo, and the Titan and to have a residual board position after Gushing. I prefer that mana sources simply do their job and had no patience anymore for the hassle of Deathrite Shaman, where you have no idea whether it will generate mana due to the ubiquity of Misstep, Plow, Decay, surprise Dig Through Times, and opposing Shamans as well as the awkwardness that results when there are no lands in the graveyard.
If there is any deck that would run more than 1 Caryatid, it would be a Superfriends list with 4 CMC sweepers/Moat where you really benefit from the color fixing and significantly from the untargetable 0/3 blocker while setting up or defending walkers. I would definitely play a Sylvan Caryatid and Sylvan Library in Nahiri if I ran it again.